AT509547B1 - METHOD AND APPARATUS FOR APPLYING A POWDERY FABRIC TO A BATH MIRROR OF A METALLIC MELT IN A METALLURGICAL VESSEL - Google Patents

Abstract

The present invention relates to a method and a system for applying a powdery substance (21) to a bath level of a metallic melt in a metallurgical vessel (3), and to the use of the plant in a continuous casting plant for the production of cast products from steel. It is an object of the invention to provide a method and a system of the type mentioned, which can be compared to the known prior art much easier, less prone to failure and cost-effective. Another object of the invention is to reduce the dust formation in the metering of the powdery substance (21). These objects are achieved by the following method steps: - piercing a blade (10) into a pour cone (14) of the powdery substance (21), wherein the blade (10) receives a quantity of the powdered substance (21); Vane (10) located powdery substance (21), wherein dosed a portion of the powdery substance (21) from the blade (10) is removed, - transporting the blade (10) and the powdery substance (21) contained therein to the metallurgical vessel ( 3); and - emptying the blade (10) above the metallurgical vessel (3) so that the powdery substance (21) is applied to the bath level of the melt.

Description

feerrecsise-ts AT509 547B1 2013-12-15

Description: Method and system for applying a powdery substance to a bath level of a metallic melt in a metallurgical vessel

FIELD OF TECHNOLOGY

The present invention relates to a method and apparatus for applying a powdery substance to a bath level of a metallic melt in a metallurgical vessel, and the use of the plant in a continuous casting plant for the production of cast products made of steel.

STATE OF THE ART

From the prior art it is known, during the continuous casting a powdery substance, such as a casting powder, a slag former or a cover powder, on a bath level of a metallic melt in a metallurgical vessel, such as a mold or a casting distributor, give up. In this case, the discontinued powdery substance fulfills different tasks, for example, in the case of the slagformer, the brawn. In the case of the cover powder, the melt is thermally insulated in a vertical upward direction or, in the case of the casting powder, the adherence of the forming casting strand to the mold is prevented. For these functions, e.g. In continuous casting in a continuous casting, be reliably fulfilled, it is necessary to give up a sufficient amount of one or more powdery substances to one or more bath levels. The powder applied to a casting distributor is often referred to as a so-called distributor powder.

From the writings CH 595161 A and CH 623758 A is ever a device with a Gießpulbewehälter and a metering device known, wherein the casting powder is metered applied to the bath level in a mold.

From the document JP 62212044 A2 it is known to apply a casting powder and an inert gas by means of a lance on a casting distributor, wherein the casting powder is enveloped in the application of an inert gas jacket.

From the publication A. Jungbauer et al. "Safety at work by robot technology -Improved protection at continuous casting plants", S & Compendium 2007, pp. 94-97, Publishing publish industry, Munich, April 2007, it is known to use an industrial robot with a blade for the application of casting or distribution powder, wherein the amount of powder is measured by means of a weighing device and this information flows into the quality system of the continuous casting plant.

Finally, DE 698 05 263 T2, JP 07-314105 A and US 3,896,257 A show devices for applying and distributing slag powder on the surface of a molten metal bath located in a continuous casting mold.

DE 698 05 263 T2 shows a device for distributing slag powder by means of a paddle-shaped powder receiving element, in which from a bunker the required (dosed) amount of cover powder is filled.

JP 07-314105 A shows an automated powder feed by means of a manipulator.

US 3,896,257 A shows the application of covering powder in an electric melting furnace by means of two spoons, which are fed from a bunker.

A disadvantage of the systems and methods according to the prior art is that the reliability of the powder application is reduced by the use of dosing or weighing devices and increases the dust formation in the dosage and the production price of the system 1/16

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SUMMARY OF THE INVENTION

The object of the invention is to provide a method and a system of the type mentioned, which can be compared to the known prior art much easier, less prone to failure and cost-effective. Another object of the invention is to reduce the dust formation in the metering of a powdery substance.

These objects are achieved by a method comprising the following method steps - piercing a blade in a bulk cone of the powdery material, wherein the blade receives a quantity of the powdery substance; Dosing the powdery material located on the blade by dosing a portion of the powdered material is stripped from the blade and moves the blade during dispensing relative to a scraping edge; - Transporting the blade and the powdery material contained therein to the metallurgical vessel; and - emptying the blade above the metallurgical vessel so that the powdery substance is applied to the bath level of the melt; - Wherein all process steps are performed by a robot.

In this case, a blade, for example, in the horizontal direction or in an oblique direction, which has, for example, a horizontal and a vertically upward component in a bulk cone of the powdery substance, so that the blade a quantity of powdered material, for example at least a substance from the group slag formers, covering powder, casting powder, receives, wherein the powdery substance is present either in non-compressed form (eg as a powdered powder or granules) or in a compacted form (eg in pelletized form). Subsequently, during dosing, a metered, i. predetermined, proportion of the located on the blade powdery substance from the blade, so that in the subsequent step, a predetermined amount of the powdered material to the metallurgical vessel, for example, to a casting distributor (engl, do-dish) or to a mold of a continuous casting plant is transported , Subsequently, the blade is emptied above the metallurgical vessel, so that the powdery substance is applied to the bath level of the melt. This process is generally repeated cyclically, depending on the powder requirement of the continuous casting process, so that a predetermined amount of one or more pulverulent substances is applied to the bath level.

In the method according to the invention, the blade during dispensing moves relative to a scraping edge, so that metered a predetermined amount of the powdery substance is stripped from the blade. This makes it possible in a simple manner and with little dust, dosed to remove a proportion of the powdery substance from the blade.

In one embodiment, the dosing is regulated. In the controlled dosing of the powdery material particularly high accuracies can be achieved; Of course, however, a controlled dosing is possible.

According to one embodiment, the control uses as a target size a position, preferably a distance in the vertical direction between the blade and the scraping edge, or a weight, preferably the weight of the at least partially filled blade. The use of the position is advantageous because the sensors associated with the position measurement are particularly robust and less susceptible to interference. When using the weight as a target size, the amount of the powdery substance is set directly regulated.

According to a particularly simple embodiment, the blade performs a relative movement

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According to a favorable embodiment, the at least partially filled blade is removed after the piercing of the bulk cone of the powdery substance. It is also possible to perform the piercing and the removal by means of one another, continuous movement, for example by a movement which has a horizontal and a vertically upward component. Such activity is known to those skilled in the art as "shoveling out". known.

According to one embodiment, the transporting comprises a pivoting movement from the pour cone to the metallurgical vessel, whereby a particularly high Auflabeleistung the powdery substance is achieved on the bath level.

According to an advantageous embodiment, the cover of the bath level is determined with the powdery substance before emptying and emptied the bucket preferably above uncovered or little covered positions. This can be ensured in a simple manner uniform coverage of the bath level with the powdery material.

It is advantageous that all method steps according to one of claims 1 to 8 are performed by a robot, for example an industrial robot. Industrial robots are available in a variety of configurations, are not very sensitive and can reduce the risk potential on the casting platform during the casting process.

A plant for carrying out the method comprises - at least one bunker for storing the powdery substance, wherein the bunker is arranged elevated in the vertical direction relative to a casting platform, so that the powdery material can leave the bunker in the form of a bulk cone; a robot connected to a blade for piercing, dosing, transporting and emptying the powdered material, wherein the blade is at least partially forward and at least partially open at the top; and a wiping edge, wherein by means of a relative movement between the blade and the wiping edge, a portion of the powdery substance can be wiped off the blade.

This system configuration is characterized by a small number of individual components and high flexibility. In this case, the powdery substance in the bunker is elevated in a vertical direction relative to a casting platform, so that the powdered material leaves the bunker in the form of a bulk cone. Due to the increased storage, the automatic Nachrieseln the powdery material is ensured after shoveling. A robot connected to a blade is used for piercing, optionally removing, dosing, transporting and emptying the pulverulent substance. In this regard, the term " robot " a manipulator (for example, a multi-axis industrial robot) understood that is capable of accomplishing the insertion, dosing, transporting and emptying of the powdered material. In the metering of the powdery substance located on the blade, a scraping edge is used, wherein by means of a relative movement between the blade and the scraping edge, a portion of the powdered substance is removed from the blade, for example scraped off.

It is particularly advantageous if the wiping edge is arranged above the material cone and oriented horizontally, so that the powdery substance removed during metering is automatically returned to the material cone.

In the system according to the invention, the blade is at least partially carried forward and at least partially open at the top.

For high Aufgabeleistungen it is advantageous if the bulk cone and the metallurgical vessel are within the minimum and maximum working range of the robot. In this regard, the term "within the minimum and maximum workspaces " understood the reachable by the blade work area, without the robot by 3/16

< id = $ patentest < / RTI > AT509 547B1 2013-12-15 an external traveling or swiveling device (e.g., a chassis associated with the robot or a pan console associated with the robot).

According to an expedient embodiment, at least one robot axis has a measuring device, for example a position or angle measuring device, for determining the actual position of the blade, or a measuring device, for example a force or moment measuring device, for determining the weight of at least partially filled bucket, with, this robot axis is connected to a control or regulating device. Thereby, a simple and effective metering of the powdered material located on the blade is made possible by means of the robot.

It has been found to be advantageous to use the system according to one of the claims 10 to 14 in a continuous casting plant for the production of cast products made of steel.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the following figures, which show: Fig. 1 to 4 a layout of a casting platform with a powder bunker, a Robot and two casting distributors Fig. 5 is a perspective view of a powder bunker for two pulverför shaped fabrics, each with a wiper edge. Fig. 6 is a front view of a powder bunker for two powdery substances, each with a wiper edge a 6-axis industrial robot with a blade Fig. 8 and 9 are schematic representations of the steps in the grooving and

Dosing a powdery substance

DESCRIPTION OF THE EMBODIMENTS

In Fig. 1 is a perspective view of a continuous casting plant with a casting stage 5 is shown. The molten steel is transported in a pan 1 with a so-called ferry from the smelting unit via the casting crane to the continuous casting and used in a ladle turret 12. Via a bottom outlet (spout), which is closed by a slide, the melt flows from the pan 1 into the casting distributor 3, wherein the liquid steel is guided in a shadow tube 2. From the Gießverteiler 3 of the liquid steel flows through a pouring tube (engl, submerged entry nozzle, short SEN) in a mold, not shown. On the casting platform 5, designed as a 6-axis industrial robots robot 8 is arranged, which is positioned on a pivoting swivel bracket 6. The robot 8 takes a powdered substance formed as a distributor powder from a powder bunker 9 and fed it to the bath level of the molten steel in the distributor 3, so that the bath level is uniformly covered with distributor powder. In order for a greater distances between the powder bunker 9 and the distributor 3 can be bridged and on the other hand, the robot 8 can be brought easily and quickly from the work area on the casting platform 5 in the event of malfunction, the robot 8 is arranged on a pivot bracket 6, which is formed pivotable about a vertical axis of rotation 7. The task of distributor powder on the bath level in the distributor 3 comprises the following method steps: First, the blade 10 is inserted into a pour cone, not shown in FIG. 1, so that the blade 10 receives a quantity of the distributor powder. Subsequently, the at least partially filled blade 10 is removed from the pour cone and the amount of distributor powder located on the blade 10 is metered, whereby a portion of the distributor powder is removed from the blade 10. The blade 10 itself and the distributor powder contained therein are subsequently transported to the distributor 3, wherein the robot 8 executes a pivoting movement. Finally, the blade 10 is emptied above the distributor and the robot 8 including the blade 10 4/16 pivoted back so that the blade 10 can be refilled with distributor powder.

The method steps for metering the distributor powder located on the blade 10 are shown in more detail in FIG. In this case, the full or partially filled blade 10 is moved relative to a stationary scraping edge 11, so that metered a portion of the distributor powder is removed from the blade 10. Specifically, the robot 8 including the blade 10 performs a stripping movement 13 in the horizontal direction, wherein the distance 15 in the vertical direction between the lower edge of the blade 10 and the lower edge of the stripping edge 11 is adjusted in position. This procedure has several advantages: low to no dust during dosing; - The distributor powder is automatically returned to the pour cone; - No fault-prone, the blade 10 and the distributor powder associated, weighing device necessary; and - high dosing accuracy. 3 and 4 Finally, Figs. 3 and 4 show how a metered quantity of distributor powder is poured into the distributor 3 by means of the robot 8 and the blade 10 so that the bath level of the molten steel is uniformly covered with distributor powder.

Fig. 5 shows a powder bunker 9 for two powdered substances, e.g. a check-off powder and a slag-forming agent. Each powdered substance is delivered in a sack, a so-called big bag (see eg http://www.bigbag.com/bigbags.html) and between the front wall 17, the rear wall 18 and the two side walls 19 in the upper region of the powder bunker 9 hooked so that the powdery substance trickles down automatically over an inclined plane 16 and an unillustrated bulk cone is formed. Expediently, the powder bunker 9 comprises a wiping device 22, which is arranged in the vertical direction above the material cone, with a wiping edge 11, so that the powdered substance is returned to the pour cone during dosing.

FIG. 6 shows a further embodiment of a powder bunker 9 for two pulverulent substances. Each powdery substance trickles down automatically over an upper inclined plane 16a and a lower inclined plane 16b down, wherein a non-illustrated bulk cone is formed. Here, the upper inclined plane 16a at a distance from the rear wall 18, so that a trickling of the powdered material is ensured with a predetermined Nachrieselgeschwindigkeit.

Fig. 7 shows a schematic representation of a trained as a 6-axis industrial robot robot 8 including a partially filled with a powdery material 21 blade 10. The axes of movement of the robot 8 are shown by dotted lines A1 to A6 ,

FIG. 8 shows the working steps during insertion of a blade 10 into a pour cone 14 of a pulverulent material, during removal of the blade 10 from the pour cone 14 and during metering of the powdery material located on the blade 10 shown. For reasons of clarity, the illustration of a robot connected to the blade 10 and a powder bunker has been dispensed with. In the upper part of the image, a blade 10, which is designed to be open at the front and upwards, is inserted in a horizontal direction into a pour cone 14 so that the blade 10 is partially filled with the powdery substance 21 (the direction of movement 13 is symbolized by an arrow). , Subsequently, the

MerrecfcLvche ;; In this case, the partially filled blade 10 is removed from the pour cone 14, lifting it in the vertical direction and retracting it in the horizontal direction (see direction of movement 13). The third partial image shows the situation before dosing, wherein during dosing, the blade 10 is displaced in the horizontal direction relative to a stationary stripping device 22 with an associated scraping edge 11, so that a portion of the powder material located on the blade 10 is removed from the blade. In this case, the distance 15 between the lower edge of the blade and the wiping edge 11 is adjusted in position, so that a predetermined amount of the powdery substance is removed.

Figure 9 shows a situation similar to that shown in Figure 8, but with dosing the scraper edge 11 of the scraper 13 is positioned below the upper edge of the scoop, i. E. that the distance between the wiping edge 11 and the lower edge of the blade 10 is less than the blade height, so that compared to Fig. 8, the quantitative spread is increased when dosing the powder material contained in the blade 10.

LIST OF REFERENCE SIGNS 1 Pan 2 Shadow tube 3 Casting distributor 4 Casting tube 5 Casting platform 6 Swivel console 7 Swivel console pivot 8 Robot 9 Powder bunker 10 Blade 11 Scraper edge 12 Pan tower 13 Direction of movement 14 Bulk cone 15 Distance 16, 16a, 16b Inclined plane 17 Front wall 18 Rear wall 19 Side wall 20 Drive motor 21 powdered substance 22 stripping device A1 to A6 rotary axes 6/16

Claims (12)

MerrecfcLvche ;; A method for applying a powdered substance (21) to a bath level of a metallic melt in a metallurgical vessel (3), comprising the following method steps: piercing a blade (10) into a pour cone (14) the powdery substance (21), wherein the blade (10) receives an amount of the powdery substance (21); Dosing the powdery substance (21) located on the blade (10) by metering a portion of the powdery substance (21) from the blade (10) and scraping the blade (10) relative to a scraping edge (11) during metering. emotional; subsequently - transporting the blade (10) and the pulverulent substance (21) contained therein to the metallurgical vessel (3); and then emptying the blade (10) above the metallurgical vessel (3) so that the powdery substance (21) is applied to the bath level of the melt; wherein all method steps are performed by a robot (8). 2. The method according to claim 1, characterized in that the dosing is controlled, wherein the control as a manipulated variable a position, preferably a distance (15) in the vertical direction between the blade (10) and the wiper edge (11) used. 3. The method according to claim 1, characterized in that the dosing is regulated, wherein the control as a target size, a weight, preferably the weight of the at least partially filled blade (10) used. 4. The method according to any one of claims 1 to 3, characterized in that the blade (10) performs a relative movement in the horizontal direction (13) relative to a stationary scraping edge (11). 5. The method according to any one of claims 1 to 4, characterized in that after the piercing, the at least partially filled blade (10) from the bulk cone (14) is removed. 6. The method according to any one of claims 1 to 5, characterized in that the transporting comprises a pivoting movement from the bulk cone (14) to the metallurgical vessel (3). 7. The method according to any one of claims 1 to 6, characterized in that before emptying the covering of the bath level with the powdery substance (21) is determined and the blade (10) is preferably emptied above uncovered or little covered positions. 8. Plant for applying a powdery substance (21) on a bath level of a metallic melt in a metallurgical vessel (3), comprising - at least one bunker (9) for storing the powdery substance (21), wherein the bunker (9) in vertical Direction increased towards a casting platform (21) is arranged so that the powdery material (21) can leave the bunker (9) in the form of a bulk cone (14); - a robot (8) connected to a blade (10) for piercing, dosing, transporting and emptying the powdery substance (21), the blade (10) being at least partially open towards the front and at least partially open upwards; and a wiping edge (11), wherein by means of a relative movement between the blade (10) and the wiping edge (11), a portion of the powdery substance (21) from the blade (10) is strippable. 7/16 Sämidifccjxs jBfSKSiKst AT509 547B1 2013-12-15 9. Plant according to claim 8, characterized in that the wiping edge (11) above the bulk material cone (14) is arranged and aligned horizontally, so that the removed in the metering powdered material (21) is automatically returned to the bulk cone (14). 10. Plant according to one of claims 8 to 9, characterized in that the pour cone (14) and the metallurgical vessel (3) are within the minimum and maximum working range of the robot (8). 11. Installation according to one of claims 8 to 10, characterized in that at least one robot axis (A1 to A6) a measuring device for determining the actual position of the blade (10), or a measuring device for determining the weight of the at least partially filled blade ( 10), and this robot axis (A1 to A6) is connected to a control device. 12. Use of the system according to one of claims 8 to 11 in a continuous casting plant for the production of cast products made of steel. For this 8-sheet drawings 8/16